Data Quantization and Processing - Image Processing and Analysis - Geomatics Engineering Previous Year Questions

1

2024 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2024

Which of the following is/are method(s) used for compact storage of raster GIS data?

A

Chain code

B

Run-length code

C

Quadtree

D

Decision-tree

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2

2024 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2024

A four-band multispectral image of size 64 × 64 pixels has 560 header bytes. The per pixel depth of the image is 2 bytes. The total number of bytes required to store this image on the disk in the Band Interleaved by Line (BIL) format will be

A

33328

B

32338

C

33823

D

33283

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3

2024 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2024

A four-band multispectral image with pixel size of 50 m × 50 m covers a ground area of 20 km × 20 km. If the radiometric resolution of the satellite data is 8 bits, then the uncompressed satellite image contains ______ kilobytes (kB) of data (in integer).

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4

2025 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2025

The scattering matrix for a fully polarimetric synthetic aperture radar pixel is given below. The \(C_{11}\) element of the covariance matrix computed with a \(1 \times 1\) window will be ____? (rounded off to 2 decimal places).
Here, \(i = \sqrt{-1}\).
\[ \begin{bmatrix} 0.1 + 0.5i & 0.1 - 0.1i \\ 0.1 + 0.1i & 0.3 - 0.5i \end{bmatrix} \]

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5

2025 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2025

A CCD array element in a remote sensing sensor measures incoming radiation and its output voltage varies linearly between 0 V to 5 V. This voltage is converted to an 8-bit digital image using an analogue to digital convertor (ADC). The ADC has a linear response without bias or noise. If the output image pixel has a digital number of 100, the input voltage to the ADC would be ______ V (rounded off to 2 decimal places).

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6

2025 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2025

Consider an imaging system with 128×128 pixels that produces a noiseless, distortion-free digital image. It is used to digitize checkerboard patterns where all squares of the pattern are in the field of view. Using this imaging system, if a checkerboard pattern with 128×128 squares is digitized, each square will be 1×1 pixel in size. What is the size of the checkerboard square in the generated digital image for which spatial aliasing is observed (measured in pixels of the imaging system)?

A

1

B

2

C

0.9

D

2.5

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7

2022 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2022

A satellite image with 6-bit radiometric resolution has _____ gray levels.

A

16

B

32

C

64

D

128

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8

2022 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2022

In a covariance matrix, the main diagonal shows the ______ of each band.

A

standard deviation

B

variance

C

mean

D

median

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9

2022 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2022

The sum of all the values of a normalized histogram is equal to __________ (in integer).

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10

2022 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2022

For a given set of radiance values, which amongst the following is/are unitless?

A

Skewness

B

Kurtosis

C

Mean

D

Standard Deviation

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11

2022 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2022

Number of bytes required to store an 8-bit uncompressed image of size 512 × 512 pixels is ______ (in integer).

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12

2023 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2023

The pixel values for a 3 band and 8-bit image are (127, 127, 127). On an RGB colour display, this pixel will appear ________.

A

green

B

black

C

gray

D

white

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13

2023 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2023

To store a 3 band, 4-bit, 512x512 size image (without header) the number of storage bits required are ________.

A

31,45,728

B

6,144

C

10,48,576

D

1,25,82,912

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14

2023 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2023

A sensor converts the influx of light linearly to digital code through voltage changes. The sensor has a voltage range of 0-5 V and the maximum number of codes that it can quantize the voltage change is 2048. The bit-size of the quantizer is __________.(In integers)

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15

2026 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2026

A square digital image of size 128 × 128 pixels requires 65536 bits of storage. What is the number of grey levels?

A

16

B

4

C

8

D

32

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16

2026 · Geomatics Engineering · Image Processing and Analysis · Data Quantization and Processing

Geomatics Engineering (GE) 2026

Principal Component Analysis (PCA) is applied on reflectance values obtained from seven bands. The following are the resultant eigenvalues.
0.39, 3.76, 13.10, 0.67, 101.00, 0.21, 0.12
The minimum number of principal components required to achieve at least 99% of total variance explained by seven bands is ______. (Answer in integer).

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